Definition:Sign of Number

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Definition

The sign of a number is the symbol indicating whether it is:

positive, denoted by the symbol $+$

or:

negative, denoted by the symbol $-$.


Hence a number's sign has evolved to define the fact of the number being positive or negative independently of the symbol itself.


Thus:

the sign of $3.14159$ is positive

and

the sign of $-75$ is negative.


Also see